some more work on emacs init.el

Emacs/emacs.org

@@ -7,7 +7,15 @@
 
 * About
 My attempt at a litterate configuration for Emacs.
-* Prep 
+to tangle this file, run the following command in Emacs:
+#+BEGIN_SRC emacs-lisp
+(org-babel-tangle)
+#+END_SRC
+or keyboard shortcut `C-c C-v t` (org-babel-tangle) in Emacs.
+This will generate the `~/.emacs.d/init.el` file with the configuration.
+
+* Prep  
+
 ** Copilot Authentication
 To use GitHub Copilot, you need to authenticate with your GitHub account. This is done by running the following command in Emacs:
 after installing the copilot package:
@@ -19,6 +27,29 @@ Try to trigger the GitHub OAuth flow from within Emacs:
 
 * Configuration
 
+** Setup lexical binding
+Here we set up lexical binding, which is a feature in Emacs Lisp that allows for more efficient variable scoping and function closures. This is recommended for performance reasons.
+#+BEGIN_SRC emacs-lisp
+;; enable lexical binding
+(setq lexical-binding t)
+#+END_SRC
+
+** Set automatic update of packages
+
+We set up Emacs to automatically update packages on startup. This ensures that we always have the latest versions of the packages we use.
+#+BEGIN_SRC emacs-lisp
+(defun geokkjer/display-startup-time ()
+  (message "Emacs loaded in %s with %d grabage collections."
+           (format "%.2f seconds"
+                   (float-time
+                    (time-subtract after-init-time before-init-time)))
+           gcs-done))
+
+(add-hook 'emacs-startup-hook #'geokkjer/display-startup-time)
+
+(setq gc-cons-threshold (* 50 1000 1000))
+#+END_SRC
+
 ** Customize UI
 Here we set up the UI to our liking. We disable the menu bar, tool bar, and scroll bar, and set the font size to 14pt.
 #+BEGIN_SRC emacs-lisp
@@ -67,6 +98,30 @@ Set up doom modeline, which is a nice status line for Emacs. We set it up to sho
 (setq use-package-always-ensure t)
 #+END_SRC
 
+** Org Mode
+Configure Org-mode for literate programming and note-taking.
+
+#+BEGIN_SRC emacs-lisp
+;; ensure org-mode is installed and up to date
+(use-package org
+  :ensure t
+  :mode ("\\.org\\'" . org-mode)
+  :config
+  ;; enable syntax highlighting in code blocks
+  (setq org-src-fontify-natively t)
+  ;; preserve indentation in code blocks
+  (setq org-src-preserve-indentation t)
+  ;; enable babel for code execution
+  (org-babel-do-load-languages
+   'org-babel-load-languages
+   '((emacs-lisp . t)
+     (shell . t)
+     (python . t)
+     (nix . t)))
+  ;; don't ask for confirmation when evaluating code blocks
+  (setq org-confirm-babel-evaluate nil))
+#+END_SRC
+
 * Code Completion and ide features
 ** LSP Mode
 Here we install lsp-mode and lsp-ui, which are the core components of the LSP (Language Server Protocol) support in Emacs. We also set up keybindings for common LSP commands.
@@ -105,27 +160,7 @@ Here we install from MELPA, enable it in all prog-modes and bind keys for comple
 ** Language support
 Here we install and configure support for various programming languages. We use the `use-package` macro to ensure that the packages are installed and configured correctly.
 
-#+BEGIN_SRC emacs-lisp
 
-;; install and configure javscript-mode
-(use-package javscript-mode
-  :ensure t
-  :mode "\\.js\\'")
-;; lsp support for javascript
-(use-package lsp-javascript
-  :ensure t
-  :mode "\\.js\\'")
-
-;; install and configure gleam-mode
-(use-package gleam-mode
-  :ensure t
-  :mode "\\.gleam\\'")
-  #+END_SRC
-;; lsp support for gleam
-(use-package lsp-gleam
-  :ensure t
-  :mode "\\.gleam\\'")
-#+END_SRC
 
 ** NixOS from Emacs
 Editing Nix files and doing NixOS admin stuff like nixos-rebuild boot --upgrade